When they get 3.0 out.
But what exactly do you mean by support 2.9? C::B compiles with 2.9 and almost runs fine 
yeah almost is the word

. On windows you get a plethora of assertions especially with the debug wxWidgets2.9(I added one
or two patches. some of them event applied to the C::B).Also there are many plugins that needs to be upgraded too.
I vaguely remember wxSmith causing crashes and debug assertions. Don't know about the latest status though.